Spectroscopic studies of electric discharges in electrospraying

Jaworek, A.; Czech, T.; Rajch, E.; Lackowski, M.

doi:10.1016/j.elstat.2005.03.029

Cited by 18 publications

(10 citation statements)

References 15 publications

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“…The electrospraying of a solution at atmospheric pressure results in a corona discharge near the nozzle tip. The high voltages create a charged jet instability that forms poly‐disperse droplets 11, 14. The experimental results showed that the resulting microstructure of the electrosprayed PCL polymeric particles had a great dependence on the pressure and solution concentration.…”

Section: Discussionmentioning

confidence: 99%

“…The high voltages create a charged jet instability that forms poly-disperse droplets. 11,14 The experimental results showed that the resulting microstructure of the electrosprayed PCL polymeric particles had a great dependence on the pressure and solution concentration. By reducing the pressure to 2150 mmHg, uniform, spherical PCL polymeric particles were obtained from a 5 w/v % solution.…”

Section: Discussionmentioning

confidence: 99%

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Polymeric particle formation through electrospraying at low atmospheric pressure

Kennedy

Clark

2008

J Biomed Mater Res

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Electrospraying is a simple and versatile technique capable of producing polymeric particles. However, most investigations carried out thus far have been performed at ambient atmospheric pressure without studying the influences of pressure on the formation of polymeric particles. Here, we report our investigation on the effects of varying the pressure and the solution concentration on the microstructures of electrosprayed polymeric particles. Pressures are varied from ambient atmospheric pressure to 380 mmHg below ambient pressure, and solution concentrations are varied over a range of 3-7 w/v %. By varying these parameters, we manipulated the rate of solvent evaporation and the solidification of the electrosprayed particles. The results show that changes to the pressure had significant effects on the microstructure and morphology of poly(epsilon-caprolactone) (PCL) particles. The average particle size became larger as the chamber pressure decreased. At a solution concentration of 5 w/v % and a pressure 150 mmHg below ambient pressure, uniform and spherical PCL particles were generated. Electrospun fibers were formed when a solution concentration of 7 w/v % was used. The developed technique can be applied to prepare polymeric drug delivery carriers though a low-pressure-assisted spray-drying method, and is particularly suitable for fabricating delivery microspheres encapsulated with temperature-sensitive drugs and biomolecules.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Polymeric particle formation through electrospraying at low atmospheric pressure

Kennedy

Clark

2008

J Biomed Mater Res

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“…Taylor cones have also been know to support subsequent corona discharges for about 100 years [52,53]. Taylor cones are normally non-static and trigger discharges or exhibit liquid spraying [54,55]. Electrical breakdown from an ethanol Taylor cone is investigated in [56].…”

Section: Breakdown In the Gas Phase With A Liquid Electrodementioning

confidence: 99%

Non-thermal plasmas in and in contact with liquids

Bruggeman

Leys

2009

J. Phys. D: Appl. Phys.

1,119

775

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During the last two decades atmospheric (or high) pressure non-thermal plasmas in and in contact with liquids have received a lot of attention in view of their considerable environmental and medical applications. The simultaneous generation of intense UV radiation, shock waves and active radicals makes these discharges particularly suitable for decontamination, sterilization and purification purposes. This paper reviews the current status of research on atmospheric pressure non-thermal discharges in and in contact with liquids. The emphasis is on their generation mechanisms and their physical characteristics.

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“…The results indicate instable growth of the electrical field near the stability limit but one should remark that their results are depending on initial conditions as the authors stated. In the case of water these dynamic effects are important because experimentally when the instability develops an electrical current flows indicating the occurrence of spraying, droplet ejection or discharges [9,15,16]. Sugimoto et al [17] studied negative corona discharges from conical water-points and observed Trichel-like current pulses.…”

Section: Introductionmentioning

confidence: 99%

Water surface deformation in strong electrical fields and its influence on electrical breakdown in a metal pin–water electrode system

Bruggeman¹,

Graham²,

Degroote³

et al. 2007

J. Phys. D: Appl. Phys.

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Electrical breakdown and water surface deformation in a metal pin–water electrode system with dc applied voltages is studied for small inter-electrode distances (2–12 mm). The radius of curvature of the metal pin is 0.5 cm to exclude corona before breakdown at these small inter-electrode spacings. Calculations of the water surface deformation as a function of the applied voltage and initial inter-electrode spacing are compared with measurements of the water elevation. For distances smaller than 7 mm the calculated stability limit of the water surface corresponds with the experimentally obtained breakdown voltage. It is proved with fast CCD images and calculations of the electrical field distribution that the water surface instability triggers the electrical breakdown in this case. The images show that at breakdown the water surface has a Taylor cone-like shape. At inter-electrode distance of 7 mm and larger the breakdown voltage is well below the water stability limit and the conductive channel at breakdown is formed between the pin electrode and the static water surface. Both cases are discussed and compared.

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Spectroscopic studies of electric discharges in electrospraying

Cited by 18 publications

References 15 publications

Polymeric particle formation through electrospraying at low atmospheric pressure

Polymeric particle formation through electrospraying at low atmospheric pressure

Non-thermal plasmas in and in contact with liquids

Water surface deformation in strong electrical fields and its influence on electrical breakdown in a metal pin–water electrode system

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